Primorskaya GRES achieves historic 170-ton stator relocation during live operations
A major milestone has been reached at Primorskaya GRES as the 170-ton stator of Unit 7’s generator was carefully removed and relocated. The operation marked the first time in the power station’s history that such a heavy component had been transported while two other units remained fully operational. Officials and engineers oversaw the delicate procedure, which required precise coordination and specialised lifting equipment. The dismantling of the stator began as part of the overhaul of Unit 7, a 210 MW power unit, under the Complex Modernization (KOMMOD) programme. Work started in mid-March, with the full scope of upgrades set to finish by the end of the year. The nine-month project includes replacing the excitation system, busbars, and generator circuit breaker, as well as upgrading the high- and intermediate-pressure rotors, regeneration system, and technical water supply.
Due to the stator’s immense weight, engineers used **two synchronised lifting mechanisms**—each with a 100-ton capacity—to safely raise and manoeuvre the component. The operation involved navigating the load at height, carefully passing two active power units before placing it in a temporary storage area near Unit 5. Over **800 specialists** across multiple trades are now working in shifts to ensure the plant continues running without interruption during the modernisation. Elena Shish, **Minister of Energy and Gas Supply for Primorsky Krai**, visited the site to observe the procedure. The upgrades aim to **boost reliability, safety, and environmental performance**, while also bringing the plant up to its full rated electrical capacity. Advanced control and monitoring technologies will be introduced as part of the process.
The replacement of Unit 7’s generator stator represents a first for Primorskaya GRES. With the overhaul scheduled for completion by late 2024, the modernisation will enhance the unit’s efficiency and extend its operational lifespan. Over 800 workers remain on-site to carry out the remaining upgrades while maintaining continuous power production.
